Shawn Mulligan wrote: > Has anyone here had experience designing battery voltage to 5V power > supplies for use in PIC microcontroller applications, within the harsh > heavy trucking industry? Yup, we've done things for boats and trucks and other places that have nasty spikes on 12V power lines. As one example, take a look at the optional automotive power filtering circuit of the QuickProto-01 (http://www.embedinc.com/products). This is an OK circuit that will do fine in most applications. For extra robustness or if higher currents were required I've used a series inductor instead of a resistor. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist